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- In libunix.a malloc(), calloc() and realloc() no longer treat a

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request to allocate 0 bytes as an error, returning NULL. They all
  return a 1 byte memory chunk initialized to 0 instead.


git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15064 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
2005-11-20 17:00:22 +00:00
parent fe29857567
commit 0459ea1fc9
7 changed files with 59 additions and 87 deletions
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36
library/stdlib_realloc.c
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@ -1,5 +1,5 @@
/*
* $Id: stdlib_realloc.c,v 1.6 2005-03-18 12:38:24 obarthel Exp $
* $Id: stdlib_realloc.c,v 1.7 2005-11-20 17:00:22 obarthel Exp $
*
* :ts=4
*
@ -65,18 +65,20 @@ __realloc(void *ptr,size_t size,const char * file,int line)
result = __malloc(size,file,line);
}
#ifndef UNIX_PATH_SEMANTICS
else if (size == 0)
{
D(("calling free(0x%08lx)",ptr));
__free(ptr,file,line);
}
#endif /* UNIX_PATH_SEMANTICS */
else
{
struct MemoryNode * mn;
BOOL reallocate;
assert( ptr != NULL && size > 0 );
assert( ptr != NULL );
/* Try to find the allocation in the list. */
mn = __find_memory_node(ptr);
@ -84,8 +86,7 @@ __realloc(void *ptr,size_t size,const char * file,int line)
#ifdef __MEM_DEBUG
{
/* If we managed to find the memory allocation,
* reallocate it.
*/
reallocate it. */
if(mn == NULL)
{
SHOWMSG("allocation not found");
@ -93,9 +94,7 @@ __realloc(void *ptr,size_t size,const char * file,int line)
kprintf("[%s] %s:%ld:Address for realloc(0x%08lx,%ld) not known.\n",__program_name,file,line,ptr,size);
/* Apparently, the address did not qualify for
* reallocation.
*/
__set_errno(ENOMEM);
reallocation. */
goto out;
}
}
@ -108,14 +107,11 @@ __realloc(void *ptr,size_t size,const char * file,int line)
if(mn == NULL || mn->mn_NeverFree)
{
SHOWMSG("cannot free this chunk");
__set_errno(ENOMEM);
goto out;
}
/* Don't do anything unless the size of the allocation has really
* changed.
*/
/* Don't do anything unless the size of the allocation
has really changed. */
#if defined(__MEM_DEBUG)
{
reallocate = (mn->mn_Size != size);
@ -132,19 +128,17 @@ __realloc(void *ptr,size_t size,const char * file,int line)
size_t rounded_allocation_size;
/* Round the total allocation size to the operating system
* granularity.
*/
granularity. */
rounded_allocation_size = __get_allocation_size(size);
assert( rounded_allocation_size >= size );
/* Optimization: If the block size shrinks by less than half the
* original allocation size, do not reallocate the
* block and do not copy over the contents of the old
* allocation. We also take into account that the
* actual size of the allocation is affected by a
* certain operating system imposed granularity.
*/
original allocation size, do not reallocate the
block and do not copy over the contents of the old
allocation. We also take into account that the
actual size of the allocation is affected by a
certain operating system imposed granularity. */
reallocate = (rounded_allocation_size < mn->mn_Size && rounded_allocation_size <= mn->mn_Size / 2);
}
}
@ -162,8 +156,6 @@ __realloc(void *ptr,size_t size,const char * file,int line)
if(new_ptr == NULL)
{
SHOWMSG("could not reallocate memory");
__set_errno(ENOMEM);
goto out;
}